SOLUTION: What should be addedto twice the rational number -7/3 to get3/7

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Question 1062815: What should be addedto twice the rational number -7/3 to get3/7
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+2%2A%28-7%2F3+%29+%2B+x+=+3%2F7+
Multiply both sides by +21+
+-98++%2B+21x+=+9+
Add +98+ to both sides
+21x+=+107+
+x+=+107%2F21+
107/21 must be added to -7/3
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check:
+-14%2F3+%2B+107%2F21+=+3%2F7+
+-98%2F21+%2B+107%2F21+=+9%2F21+
+107%2F21+=+107%2F21+
OK